A digital signature is another key aspect of ensuring the security, authenticity and integrity of data in a message, software or digital document. As their name suggests, they act similarly to physical signatures and are a unique way to bind your identity to data and therefore act as a way to verify the information. But rather than having a unique character to represent your identity like with physical signatures, digital signatures are based on public-key cryptography. The digital signature comes as code, which is then attached to the data thanks to the two mutually authenticating keys. The sender creates the digital signature by using a private key to encrypt the signature-related data, with the receiver getting the signer’s public key to decrypt the data. This code acts as proof that a message was created by the sender and that it has not been tampered with while being transferred, and it ensures that the sender cannot deny they sent the message.